Circuit for detecting leakage in power supply
First Claim
1. A leakage detection circuit for use in a power source device provided with a cell unit comprising a plurality of cells, the leakage detection circuit for use in the power source device being characterized in that the circuit comprises:
- a first current path being connected to opposite electrodes of the cell unit, and having a reference point generating a reference voltage corresponding to potential difference between the opposite electrodes, a second current path being connected to the opposite electrodes of the cell unit, and having three points which are different in potential difference, the three points of which an intermediate point is connected to a grounding via an insulation resistor, a first and second comparators having one input end to which voltage is applied from each of the two points divided by the intermediate point of the second current path, and having the other input end to which reference voltage is applied from the reference point of the first current path, and a detection circuit detecting leakage occurrence based on outputs of the first and the second comparators.
1 Assignment
0 Petitions
Accused Products
Abstract
A power source device comprises a cell unit 12 comprising a plurality of cells 12a. Connected between a positive side terminal and a negative side terminal of the cell unit 12 is a first current line 34 having two voltage dividing resistors 30, 32 interposed therebetween, and is a second current line 22 having two protection resistors 14, 16 and two detection resistors 18, 20 interposed therebetween. An intermediate point 24 of the second line 22 is grounded to a grounding 26 via an insulation resistor 28. The voltage difference between a voltage (V1, V2) detected by the detection resistors 18, 20 and a reference voltage (Vc) obtained from a point of connection 35 between the voltage dividing resistors is input to two Op-Amps 36, 38 serving as the input voltage (V1IN, V2IN). Based on the output voltage (V1OUT, V2OUT) obtained from the Op-Amps 36, 38, leakage occurrence is detected.
-
Citations
8 Claims
-
1. A leakage detection circuit for use in a power source device provided with a cell unit comprising a plurality of cells, the leakage detection circuit for use in the power source device being characterized in that the circuit comprises:
-
a first current path being connected to opposite electrodes of the cell unit, and having a reference point generating a reference voltage corresponding to potential difference between the opposite electrodes, a second current path being connected to the opposite electrodes of the cell unit, and having three points which are different in potential difference, the three points of which an intermediate point is connected to a grounding via an insulation resistor, a first and second comparators having one input end to which voltage is applied from each of the two points divided by the intermediate point of the second current path, and having the other input end to which reference voltage is applied from the reference point of the first current path, and a detection circuit detecting leakage occurrence based on outputs of the first and the second comparators. - View Dependent Claims (2)
-
-
3. A leakage detection circuit for use in a power source unit provided with a cell unit comprising a plurality of cells, the leakage detection circuit for use in the power source device being characterized in that the circuit comprises:
-
a first current line having opposite ends connected to opposite electrodes, respectively, of the cell unit, and having first and second voltage dividing resistors connected in series each other, and having the resistors interposed between the opposite ends, a second current line having opposite ends connected to opposite electrodes, respectively, of the cell unit, and having connected in series sequentially a first protection resistor, a first detection resistor, a second detection resistor, and a second protection resistor, and having the resistors interposed between the opposite ends, a grounding connection line connecting to a grounding via an insulation resistor a point of connection between the first detection resistor and the second detection resistor which are interposed on the second current line, a first comparator having one input end connected to a point of connection between the first protection resistor and the first detection resistor which are interposed on the second current line, and having the other input end connected to a point of connection between the first voltage dividing resistor and the second voltage dividing resistor which are interposed on the first current line, a second comparator having one input end connected to a point of connection between the second detection resistor and the second protection resistor which are interposed on the second current line, and having the other input end connected to a point of connection between the first voltage dividing resistor and the second voltage dividing resistor which are interposed on the first current line, and a detection circuit detecting leakage occurrence based on outputs of the first and the second comparators. - View Dependent Claims (4, 5, 6, 7, 8)
-
Specification